Re: [PATCH v2 14/46] drm/mediatek: Add support for MuteX trigger-sources parsing

[CK Hu (胡俊光)]

On Tue, 2026-07-14 at 13:43 +0200, AngeloGioacchino Del Regno wrote:
> Add support for getting the Mute-X trigger source ID from the
> devicetree of each component requiring one.
> 
> In order to retain compatibility with older devicetrees that are
> not specifying one, add a hardcoded table of Mute-X IDs in the
> mtk_drm_legacy code, and inject all of the hardcoded identifiers
> during initialization in mtk_drm_drv if the MediaTek Mute-X node
> does not have #trigger-source-cells as this implies that the
> driver is surely dealing with an old devicetree.
> 
> While at it, also migrate the mtk_disp_ovl_adaptor registration
> mechanism to mtk_drm_legacy and change its platform data to get
> a struct mtk_drm_private instead of mmsys_dev: this is done in
> order to get a handle to the MuteX node in OVL_ADAPTOR, which
> purpose is to get the legacy trigger IDs through, again, tables
> in mtk_drm_legacy.
> 
> Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@xxxxxxxxxxxxx>
> ---

[snip]

> @@ -856,7 +851,6 @@ static int mtk_drm_probe(struct platform_device *pdev)
>  	struct mtk_mmsys_driver_data *mtk_drm_data;
>  	struct device_node *node;
>  	struct component_match *match = NULL;
> -	struct platform_device *ovl_adaptor;
>  	int ret;
>  	int i;
>  
> @@ -904,17 +898,6 @@ static int mtk_drm_probe(struct platform_device *pdev)
>  	if (!private->all_drm_private)
>  		return -ENOMEM;
>  
> -	/* Bringup ovl_adaptor */
> -	if (mtk_drm_find_mmsys_comp(private, DDP_COMPONENT_DRM_OVL_ADAPTOR)) {
> -		ovl_adaptor = platform_device_register_data(dev, "mediatek-disp-ovl-adaptor",
> -							    PLATFORM_DEVID_AUTO,
> -							    (void *)private->mmsys_dev,
> -							    sizeof(*private->mmsys_dev));
> -		mtk_ddp_comp_init(&ovl_adaptor->dev, NULL, &private->hlist,
> -				  DDP_COMPONENT_DRM_OVL_ADAPTOR);
> -		component_match_add(dev, &match, compare_dev, &ovl_adaptor->dev);

Bringup ovl_adaptor is different with latest upstream version,
so rebase on latest code.

> -	}
> -
>  	/* Iterate over sibling DISP function blocks */
>  	for_each_child_of_node(phandle->parent, node) {
>  		enum mtk_ddp_comp_type comp_type;
> @@ -979,6 +962,17 @@ static int mtk_drm_probe(struct platform_device *pdev)
>  		goto err_node;
>  	}
>  
> +	/* If mtk-mutex is not a trigger source, this is an old devicetree */
> +	if (!of_property_present(private->mutex_node, "#trigger-source-cells")) {
> +		ret = mtk_drm_legacy_inject_mutex_trig_ids(&private->hlist, private->mutex_node);
> +		if (ret)
> +			return ret;

goto err_node;

> +	}
> +
> +	/* Bringup ovl_adaptor */
> +	if (mtk_drm_find_mmsys_comp(private, DDP_COMPONENT_DRM_OVL_ADAPTOR))
> +		mtk_drm_legacy_ovl_adaptor_probe(dev, private, &match);
> +
>  	pm_runtime_enable(dev);
>  
>  	platform_set_drvdata(pdev, private);
> 

[snip]

> +
> +static const struct of_device_id mtk_drm_legacy_mtk_mutex_match[] = {
> +	{ .compatible = "mediatek,mt2701-disp-mutex", .data = &mt2701_legacy_mtx_data },
> +	{ .compatible = "mediatek,mt2712-disp-mutex", .data = &mt2712_legacy_mtx_data },
> +	{ .compatible = "mediatek,mt6795-disp-mutex", .data = &mt8173_legacy_mtx_data },
> +	{ .compatible = "mediatek.mt6893-disp-mutex", .data = &mt6893_legacy_mtx_data },

"mediatek,mt6893-disp-mutex"

Regards,
CK

> +	{ .compatible = "mediatek,mt8167-disp-mutex", .data = &mt8167_legacy_mtx_data },
> +	{ .compatible = "mediatek,mt8173-disp-mutex", .data = &mt8173_legacy_mtx_data },
> +	{ .compatible = "mediatek,mt8183-disp-mutex", .data = &mt8183_legacy_mtx_data },
> +	{ .compatible = "mediatek,mt8186-disp-mutex", .data = &mt8186_legacy_mtx_data },
> +	{ .compatible = "mediatek,mt8188-disp-mutex", .data = &mt8188_legacy_mtx_data },
> +	{ .compatible = "mediatek,mt8192-disp-mutex", .data = &mt8192_legacy_mtx_data },
> +	{ .compatible = "mediatek,mt8195-disp-mutex", .data = &mt8195_legacy_mtx_data },
> +	{ .compatible = "mediatek,mt8365-disp-mutex", .data = &mt8365_legacy_mtx_data },
> +	{ /* sentinel */ },
> +};
> +